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LMV721 Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMV721
Description  10MHz, Low Noise, Low Voltage, and Low Power Operational Amplifier
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMV721 Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Application Notes (Continued)
4.0 TYPICAL SINGLE-SUPPLY APPLICATION CIRCUITS
4.1 Difference Amplifier
The difference amplifier allows the subtraction of two volt-
ages or, as a special case, the cancellation of a signal
common to two inputs. It is useful as a computational ampli-
fier, in making a differential to single-ended conversion or in
rejecting a common mode signal.
4.2 Instrumentation Circuits
The input impendance of the previous difference amplifier is
set by the resistor R
1,R2,R3 and R4. To eliminate the
problems of low input impendance, one way is to use a
voltage follower ahead of each input as shown in the follow-
ing two instrumentation amplifiers.
4.2.1 Three-op-amp Instrumentation Amplifier
The LMV721/722 can be used to build a three-op-amp in-
strumentation amplifier as shown in Figure 6
The first stage of this instrumentation amplifier is a
differential-input, differential-output amplifier, with two volt-
age followers. These two voltage followers assure that the
input impedance is over 100M
Ω. The gain of this instrumen-
tation amplifier is set by the ratio of R
2/R1.R3 should equal
R
1 and R4 equal R2. Matching of R3 to R1 and R4 to R2
affects the CMRR. For good CMRR over temperature, low
drift resistors should be used. Making R
4 slightly smaller
than R
2 and adding a trim pot equal to twice the difference
between R
2 and R4 will allow the CMRR to be adjusted for
optimum.
4.2.2 Two-op-amp Instrumentation Amplifier
A two-op-amp instrumentation amplifier can also be used to
make a high-input impedance DC differential amplifier (Fig-
ure 7). As in the two-op-amp circuit, this instrumentation
amplifier requires precise resistor matching for good CMRR.
R
4 should equal to R1 and R3 should equal R2.
4.3 Single-Supply Inverting Amplifier
There may be cases where the input signal going into the
amplifier is negative. Because the amplifier is operating in
single supply voltage, a voltage divider using R
3 and R4 is
implemented to bias the amplifier so the input signal is within
the input common-common voltage range of the amplifier.
10092220
FIGURE 4. Cancelling the Error Caused by Input Bias
Current
10092221
FIGURE 5. Difference Application
10092230
FIGURE 6. Three-op-amp Instrumentation Amplifier
10092222
FIGURE 7. Two-op-amp Instrumentation Amplifier
www.national.com
10


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